You must have not read the article. McCarthy says Comey lied/misrepresented the dossier (as to its corrupt origin, etc.)) to Trump in order to steer Trump away from shutting down the investigation.
But McCarthy also says:
“If [FBI/DOJ] had not believed those allegations were credible, they would not have put them in a warrant application to the FISA Court.”
and
“Or you can believe that Obama officials, altruistically motivated to protect national security, were convinced that Trump was in cahoots with the Kremlin, and they were desperately trying to prove it”
and
“In reality, Comey did suspect the president of wrongdoing and calculated that, at some point, the FBI would find the proof.”
That’s why I say McCarthy is having a hard time coming to the conclusion that Comey et al were operating in bad faith.
In truth, they knew this was Hillary campaign-generated crap. McCarthy wants to pretend they were operating in good faith, truly believed the dossier was credible, etc. Nonsense.